Hack to fetch_by_region to make it look for 'group' if 'chromosome' is not available
Hack to fetch_by_region to make it look for 'group' if 'chromosome' is not available

danstaines/ensembl,james-monkeyshines/ensembl,willmclaren/ensembl,at7/ensembl,at7/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,muffato/ensembl,muffato/ensembl,danstaines/ensembl,at7/ensembl,mjg17/ensembl,muffato/ensembl,at7/ensembl,Ensembl/ensembl,Ensembl/ensembl,willmclaren/ensembl,mjg17/ensembl,mjg17/ensembl,muffato/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,danstaines/ensembl,Ensembl/ensembl